12-03-2015, 07:36 AM
(This post was last modified: 12-03-2015, 07:38 AM by Brightcolours.)
SLRs do not close the aperture for AF. The sensors have their own limitation, from their own optics, limiting what they get to f5.6, f4 or f2.8 depending on focus point, sensor design, camera.
The mentioned spherical aberration AF issues do not occur during the AF itself, though. The spherical aberrations the AF "sees" are those from the wide open lens, even if the AF sensor has its own aperture of f5.6 or f2.8. The error occurs with the lens stopping down, shifting the focus plane, when taking the photo/after the AF is done.
Regarding the 10D, it is a very old dog. The user interface is very, very awkward by today's standards, the LCD is very small and low res., the 6mp sensor rather limiting in resolution and noise above ISO 200. The AF issue you see is a combination of lens and camera. No way to predict how other lenses will perform.
No idea why you would want to go get a MFT or Sony mirrorless and expensive metabones adapters, and go Canon lenses.
Either go mirrorless if you think you will like that (it is not for me...), or go new Canon DSLR. And then buy lenses for the new platform. Any Canon DSLR will have waaaay better AF performance than the old 10D you have.The AF in a 100D or 650D or 700D or 760D is much, much improved compared to that old thing.
By the way, mirrorless cameras with contrast detect AF can still missfocus, sometimes badly, depending on lens (even native lenses). You still have to check results.
The mentioned spherical aberration AF issues do not occur during the AF itself, though. The spherical aberrations the AF "sees" are those from the wide open lens, even if the AF sensor has its own aperture of f5.6 or f2.8. The error occurs with the lens stopping down, shifting the focus plane, when taking the photo/after the AF is done.
Regarding the 10D, it is a very old dog. The user interface is very, very awkward by today's standards, the LCD is very small and low res., the 6mp sensor rather limiting in resolution and noise above ISO 200. The AF issue you see is a combination of lens and camera. No way to predict how other lenses will perform.
No idea why you would want to go get a MFT or Sony mirrorless and expensive metabones adapters, and go Canon lenses.
Either go mirrorless if you think you will like that (it is not for me...), or go new Canon DSLR. And then buy lenses for the new platform. Any Canon DSLR will have waaaay better AF performance than the old 10D you have.The AF in a 100D or 650D or 700D or 760D is much, much improved compared to that old thing.
By the way, mirrorless cameras with contrast detect AF can still missfocus, sometimes badly, depending on lens (even native lenses). You still have to check results.